What is pu glue? How to choose the right glue?

There are many kinds of glue. Common glue may be plastic glue or manual glue and special glue used in decoration. Pu glue is recommended today. How can I choose the glue that suits me? Through the following examples, we can know that it is necessary to make reasonable purchase and arrangement according to the type limitation, size, hardness and temperature and humidity of the actual place, and regular maintenance can achieve satisfactory results. Specific can refer to the knowledge given below for analysis.

What is 1.pu glue?

PU glue is commonly known as white glue and its chemical name is polyurethane resin. PU materials are widely used in thermal insulation materials, synthetic leather, aerospace materials, shoe materials and so on. PU adhesive can be used to bond PVC, TPR, rubber, nylon cloth, ABS, synthetic leather and other PU cooperative materials.

PU adhesive has excellent adhesion fastness, good heat resistance and weather resistance, colorless and translucent, environmental protection and non-toxic, convenient operation, and is suitable for assembly line production.

There are waterborne PU glue and oily PU glue.

Second, how to choose the right glue?

Glue is one of the raw materials used in the industrial field, and it is needed in almost all walks of life. Then, what if we can choose the most suitable glue to achieve product bonding, leak-trapping, sealing or other purposes?

Choosing the right glue must first determine two points: the adhered material and the bonding process requirements. In layman's terms, it is sticky or something. What are the requirements after posting? Many glues are universal. Plastic, metal and rubber can be bonded, such as 502 glue, which is the most common glue in life. Everything can be bonded, but nothing is very good and strong, so the following principles should be followed when choosing the right glue:

1, considering the types, properties and hardness of bonding materials;

( 1)? Metal: after surface treatment, the oxide film on the metal surface is easy to bond; Because of the great difference between the two-phase linear expansion coefficients of bonding metal, the bonding layer is easy to produce internal stress; In addition, due to the action of water, the metal joint is prone to electrochemical corrosion.

(2)? Rubber: The greater the polarity of rubber, the better the bonding effect. Among them, nitrile rubber has high polarity and high bonding strength; Natural rubber, silicone rubber and isobutylene rubber have low polarity and weak adhesion. In addition, there are often release agents or other free additives on the rubber surface, which hinders the bonding effect.

(3)? Wood: It is a porous material, which absorbs moisture easily, causing dimensional changes and possibly stress concentration. In addition, polished materials have better adhesive properties than wood with rough surface.

(4)? Plastics: Highly polar plastics have good adhesive properties.

(5)? Glass: From a microscopic point of view, the surface of glass is composed of numerous uniform uneven parts. Use an adhesive with good wettability to prevent the possible influence of bubbles in concave and convex parts. In addition, glass is mainly composed of si-o-, and its surface layer is easy to absorb water. Because of the strong polarity of glass, polar glue can easily combine with the surface through hydrogen bonding, forming a firm bond. Glass is fragile and transparent, which should be considered when choosing adhesive.

The above recommendation is about a common glue, that is, the basic knowledge of pu glue. In addition, we also give some points that should be paid attention to in the process of choosing the role that suits us. Therefore, the so-called pu glue is what we usually call white glue. It also has a more professional name, which is polyurethane resin. Products are widely used in processing and producing thermal insulation materials, synthetic leather, aerospace materials and other products. They are colorless, translucent liquid, environmentally friendly and nontoxic, and will not release toxic and harmful pollutants. You can make reasonable arrangements with reference to the knowledge mentioned above. I believe this will achieve satisfactory results.